Thanks again for the help, everyone. For those asking, the amp is a McIntosh MC58. I've bridged the first three channels for the left, right and center speakers, which makes them all 100w each. There are still two more 50 watt channels the amp has which I'm not currently using because I'm not running a full surround setup and we're only using it for stereo listening, or to watch TV.

I will be changing the voltage to 2.5 as soon as I get home today, and hopefully that works.